DE102004052010B4 - Test bench for pressurized safety equipment - Google Patents

Abstract

Test bench for pressurized safety devices, which are acted upon by a test pressure by liquid pressure medium, the liquid pressure medium from a container (28) is provided and the pressure of the liquid pressure medium with a pump (33) generated and readable by means of a pressure gauge / manometer (44) / is detectable, where
the pump (33) is connected to the container (28) via a first pressure medium line (34), from the container (28) a second pressure medium line (37) leads to a three-way ball valve (43), a high-pressure hose (45) to the three-way ball valve ( 43) and from the three-way ball valve (43) leads to the container (28) a third pressure medium line (51), wherein the high-pressure hose (45) connectable to the safety device to be tested and acted upon by a test pressure by liquid pressure medium and by detection
- the pressure drop of the test pressure with the pressure gauge / manometer (44) and / or
- A change in the container (28) located amount of pressure medium by means of a balance (27) or
- the discharge of pressure medium from ...

Description

The The invention relates to a test stand for pressurized Safety equipment.

safety equipment in the form of compressed gas containers are portable, filled with compressed gas containers, which are used to remove the Pressure gases are transported to another location. Pressurized gases are Substances whose temperature is below 50 ° C or whose vapor pressure at 50 ° C is more than 3 bar.

These have to a recurring test by experts be subjected to what corresponding technical rules apply, for example: TRG 765 "Directive for recurring Exams from Compressed gas containers by the expert "for the examination of Gas pressure vessels made of steel and DIN EN ISO 11623 "Periodic inspection of Gas cylinders made of composite materials "for the exam of compressed gas tanks made of composite materials (composite pressure vessel). The examination intervals expire within given deadlines, e.g. every 3 to 5 years, resulting there is a high volume of gas bottles to be tested.

For simultaneous testing of several gas bottles was gem. DE 200 20 340 U1 a Druckprüfvorrichtung developed, which consists of a portal with a horizontal bridge part on which a manifold is guided, a high-pressure pump, which is connected with suction and pressure side to the manifold and with a, containing a pressure medium reservoir, which is connected to the suction side of the high-pressure pump is. Several test lines branching off from the manifold are individually closable via shut-off valves and each have at their ends a quick-action coupling for connection to the gas cylinders to be tested. The pressure medium used is preferably water. The pressure testing device can also be designed as a turning device for the gas cylinders, in which case a non-illustrated L-shaped hook with its long leg is parallel to the bridge part and with its short leg into the opening of a gas cylinder can be inserted.

Since each bottle is turned over separately, the handling for a large throughput is unfavorable. Furthermore, this tester can only be used for steel bottles. A test and rinsing system for hollow bodies of various sizes, with which a loading of the system and the turning and tilting of the heavy hollow body to be avoided by hand, describes DE 14 41394 U1 , Here, frames are moved by carrying rollers and directional rollers on a vertically curved monorail guide. Each frame is assigned a forked variable-position sliding support. This system has a relatively complicated structure and is also suitable only for steel bottles. A method and a device for testing compressed gas cylinders, wherein the liquid in the liquid container communicates with the ambient atmosphere, and an electronic measuring device for detecting the filling level is in DE 197 49 208 A1 presented. The measuring device consists of a liquid container which is filled to the level of the upper edge of the compressed gas cylinder with water and having a transducer. The interior of the compressed gas cylinder is connected via a line to a high-pressure pump, which pumps water into the compressed gas cylinder. The pressure is via a pressure gauge 9 read.

Of the Flow sensor measures the level dependent pressure of water in the liquid container and allows considering the ambient pressure, the measurement of the filling level and thus the degree of expansion the compressed gas cylinder. This solution is for testing of gas cylinders made of composite materials and it can always be only one compressed gas cylinder tested become. In addition to compressed gas cylinders are also safety valves one recurring examination at predetermined intervals to undergo.

DE 35 25 188 A1 describes a method and apparatus for testing a pilot operated safety valve. With this solution, the pressure drop in the valve is checked. A device for checking the function of spring-loaded safety valves for checking the contact pressure is in DE 37 37 095 A1 disclosed. The two aforementioned solutions are relatively complex and can only be used to test safety valves.

task The invention is a test stand for pressurized To develop safety devices of a simple design has and the test of different safety devices allows as security devices preferably safety valves or compressed gas cylinders made of different materials, e.g. Steel and composite material allows.

These The object is achieved with the features of the first claim. advantageous Embodiments emerge from the subclaims.

In the test stand according to the invention for safety devices which can be acted upon by a test pressure by liquid pressure medium, wherein the liquid pressure medium is provided from a container and the pressure of the liquid pressure medium can be generated with a pump and by means of egg nes pressure gauge can be read / recorded, the pump is connected via a first pressure medium line to the container, wherein from the first pressure medium line a second pressure medium line leads to a three-way ball valve, a high-pressure hose is connected to the three-way ball valve and from the three-way ball valve to the container a third pressure medium line leads in which the safety device to be tested can be connected to the high-pressure hose and subjected to a test pressure by liquid pressure medium and by detecting the pressure drop of the test pressure with the pressure gauge and / or a change in the amount of pressure medium in the water tank and / or the discharge of pressure medium the safety device is testable.

• – in eine Prüfposition, in welcher der Anschluss/das Anschlussgewinde des Druckgasbehälters nach oben weist und
• – in eine Entlehrungsposition, in welcher der Anschluss/das Anschlussgewinde des Druckgasbehälters nach unten weist,

um eine Schwenkachse schwenkbar ist.When testing pressurized safety devices in the form of compressed gas containers they are connected with their connection / connection thread to the high-pressure hose and received in a rotating device having a support element for horizontal placement of at least one gas cylinder in the starting position, wherein the launched compressed gas container can be fixed by means of a fixing element on the support element is and that the support element from the starting position

• - In a test position in which the connection / the connection thread of the gas cylinder points upwards and
• - In a Entlehrungsposition in which the connection / the connection thread of the gas cylinder pointing down,

is pivotable about a pivot axis.

To is the support element of the rotating device on two opposite Sides rotatably mounted and preferably in the manner of a table or Frame formed. For secure positional fixation, the support element and the fixing element for every compressed gas tank prismatic support or fixing surfaces. The pivot axis of the Rotary device is preferably in the middle of the compressed gas tank.

The Support element is at its side via a first shaft on a first vertical support and on its opposite Page over a second shaft mounted on a second vertical support, wherein the first and second carrier on a stand support.

The Turning device can be operated manually or by means of a motor be. With manual operation this is done by means of a rotatable about a rotation axis crank, wherein the turning device in the starting position, test position and emptying position, e.g. can be fixed by means of a retaining bolt. To the effort for the crank movement keeping small is a translation between the crank and the rotator in the form of two gears available. For example, the crank is on the side of the second vertical beam and the water tank on the first vertical support arranged.

Of the container is preferred as a water tank trained and sits on a mounted on the first vertical support Table. Under the water tank there may be a scale. Also on the first vertical support the pump over the water tank arranged. The pump is preferred as a compressed air driven liquid pump educated and over a compressor hose connected to a compressor, wherein the Connection between pump and compressor can be interrupted via a block ball valve and preferably a filter disposed between the pump and block ball valve is. Furthermore, the pump is over a first pressure medium line connected to the water tank. From the first Pressure medium line leads a second pressure medium line to a three-way ball valve, with which also a high pressure hose connected is. In the second pressure medium line is more advantageous Make a check valve.

From the three-way ball valve leads a third pressure medium line to the water tank.

Between the second pressure medium line and the third pressure medium line is a safety valve and in the highest pressure line a pressure gauge intended.

For compressed gas tank in Form of pressurized gas cylinders made of steel, the examination of the Tightness by means of hydraulic pressure test over the Recording the test pressure, in a defined review period may not fall off, for Compressed gas containers in the form of compressed gas cylinders made of composite materials by determination by the test pressure remaining extent beyond those detectable with the scale Weight difference of the water volume in the water tank before and after the test pressure.

It can one or more compressed gas containers in the form of compressed gas cylinders inserted into the tester and be checked consecutively or simultaneously. For the simultaneous Check Each compressed gas cylinder is a high pressure hose and a pressure gauge assigned. In the simultaneous examination of Composite gas cylinders are also required for each one separate water tank and a separate scale.

To test a safety valve, it is connected to the high pressure hose and subjected to the required test pressure. The safety valve to be tested is advantageously associated with a collecting means for escaping pressure medium (eg a collecting container). Under the collecting container can also be arranged a balance. The amount of leaked through the safety valve pressure medium can be determined either by measuring the lack of pressure medium in the liquid container, which is located under the pump or by measuring the amount of pressure medium, which is located in the collecting container, via the corresponding scale. The invention provides a simple and reliable testing device for testing different pressurizable safety devices.

It can For the first time pressurized safety devices in the form of Safety valves and both gas cylinders made of steel and compressed gas cylinders be tested from composite materials.

It is possible, read the measured values and evaluate accordingly, alternatively can the values are also recorded electronically and with an evaluation and Display unit are evaluated and displayed, which makes it special It becomes easy to electronically store the processed data and evaluate.

The Invention will be described below with reference to an embodiment and associated drawing explained in more detail. It shows:

1 : Schematic representation (front view) of the device for testing 3 compressed gas cylinders in test position,

2 : Front view with 2 compressed gas cylinders in initial position,

3 : Side view from the direction of the pump,

4 : Side view from the direction of the crank.

5 : Schematic representation (front view) of the device for testing a valve

In 1 to 4 is a manually operable test device for testing compressed gas containers S1, S2, S3 ..... in the form of pressurized gas cylinders made of steel and composite materials. On the horizontal stand resting on the floor 1 extend at a distance from a first vertical support 1a and a second vertical support 1b , Between both carriers 1a . 1b is the support element 2 on both sides 2a . 2c pivotally mounted about the pivot axis AD. This is done via a first wave 8th and a second wave 12 , About a first gear 16 and a second gear 23 becomes the crank 26 on the second carrier 1b is rotatably mounted in the axis of rotation AK, realized a favorable ratio. The respective desired pivot position is via a retaining bolt 17 ( 2 ) fixed in holes 18.1 . 18.2 . 18.3 ( 3 ) can intervene.

At the first carrier 1a a table T is fixed on which the scales 27 and on it a container 28 sitting in the form of a water tank. Also on the first carrier 1a is the pump 33 attached and via a compressor hose 29 (with block ball valve 30 ) connected to the compressor K. Between pump 33 and block ball valve 30 is a filter 31 intended.

The pump 33 is via a first pressure medium line 34 connected to the water tank. From the first pressure medium line 34 leads one with a check valve 36 provided second pressure medium line 37 to a three-way ball valve 43 , on which also a high-pressure hose 45 connected. Furthermore, to the three-way ball valve 43 a third pressure medium line 51 connected to the container 28 (Water tank) leads. Between the second pressure medium line 37 and the third pressure medium line 51 is a preferably spring-loaded safety valve 39 ( 4 ) arranged. At the end of the high pressure hose 45 there is a hydraulic hose coupling 46 ,

Gem. 1 were compressed three gas cylinders S1, S2, S3 (gas cylinders) in the tester (between support element 2 and fixing element 3 ) and with the crank 26 by 90 ° in the illustrated test position from the in 2 pivoted starting position shown. The connecting threads W1, W2, W3 point upwards. At the connection thread W1 of the first compressed gas tank S1 was a test hose 53 connected, which is connected to the hydraulic coupling.

The starting position with horizontally resting on the support element two compressed gas containers S1, S2 in the form of gas cylinders shows 2 , The support element 2 has prismatic bearing surfaces 2.1 and the fixing element 3 prismatic fixing surfaces 3.1 in V-shaped arrangement for each compressed gas tank S1, S2. The fixing element 3 consists of two strips, which are threaded rods 5 and nuts 6 . 7 and 4 be clamped so that the compressed gas containers are securely positioned position. The test device without compressed gas tank and compressor in starting position in side view from the direction of the crank 26 shows 3 and from the direction of the water box 28 4 ,

In 5 the side view of the device for testing a safety valve is shown. The structure of the device corresponds to the gem. 1 to 4 described embodiment. The safety valve V was on the high pressure line 45 via the hydraulic hose coupling 46 connected. The safety valve V is still a collecting container 54 assigned.

The functionality is as follows:
The desired number of compressed gas tanks (gas cylinders) S1, S2 ... is at the, located in the starting position, horizontally oriented support element 2 (which with the retaining bolt 17 is fixed) in the area of the bearing surfaces 2.1 which automatically positions them in the correct position. Now the fixation element 3 via the pressurized gas containers (gas cylinders) S1, S2 ... with its fixing surfaces 3.1 placed and thus also positionally positioned. Now be with the threaded rods 5 the support element 2 and the fixing element 3 clamped, so that the compressed gas tank (gas cylinder) S1, S2 ... are firmly clamped therebetween. The retaining bolt 17 will now be removed and the crank 26 turned so that support element 2 and fixing element 3 rotate 90 ° and the intermediate compressed gas containers (gas cylinders) S1, S2, S3 are vertical ( 1 ), so that their connection thread W faces upwards and then again with the retaining bolt 17 secured in this test position.

If compressed gas cylinders S1, S2, S3 in the form of steel cylinders are filled to the brim with water (via a line, not shown), it must be ensured that there is water in the line system including the ultra-high pressure hose 45 located. The hydraulic hose coupling 46 will now pass over the test tube 53 connected to the connecting thread W of the first compressed gas tank S1. The three way ball valve 43 must be placed so that water in the high pressure hose 45 can flow.

The block ball valve 30 is opened and the compressor K employed on the operator side, causing the pump 33 is operated and water from the container 27 over the first pressure medium line 34 and the second pressure medium line 37 and over the three way ball valve 43 in the high pressure hose 45 and thus in the first steel bottle (gas cylinder S1) can flow. As a result, the pressure in the gas cylinder S1 increases. Is on the pressure gauge 44 to read that the required test pressure has been reached, the block ball valve 30 closed and the compressed air driven liquid pump 33 turns off automatically.

Excess pressure is caused by the spring-loaded safety valve 39 relieved.

The check valve 36 prevents water from flowing back from the gas cylinder S1 to be tested and the test pressure drops. The steel bottle (gas bottle) must hold the test pressure (300 bar) for 3 minutes without pressure drop.

Thereafter, the test pressure is lowered to the operating pressure. This is the three-way cock 43 positioned so that the water from the pressurized gas container S1 through the test tube 53 , the highest pressure hose 45 and the third pressure medium line 51 into the water tank / container 28 flows. The pressure in the compressed gas tank (the gas cylinder) S1 now drops back to zero. The first compressed gas tank S1 (the first gas cylinder) is now disconnected and the test process for the other two compressed gas tank S2, S3 repeated. Below is the retaining bolt 17 solved and the support element 2 with the compressed gas containers S1, S2 .... by 180 ° by actuating the crank 26 pivoted so that the connecting threads W1, W2, W3 facing down (not shown). This position will be restored with the retaining bolt 17 fixed. The emptying of the compressed gas tank is now carried out by air pressure. Subsequently, the compressed gas containers are dried from the inside by warm air.

Finally, the retaining bolt is released again and the rotating device with the crank 26 turned back to the starting position. The fixing element 3 is removed and the tested gas cylinders can be removed from the tester and the next compressed gas containers to be tested are inserted. The loading of the device with the gas cylinders in the form of steel bottles is carried out either by crane or by hand. The scale is not used for the above-mentioned testing of steel cylinders.

The exam of compressed gas tanks in the form of composite gas cylinders, except for the difference that here is a scale for recording the Weight of the water tank during the test procedure is required.

If the compressed gas containers are filled in the form of gas cylinders made of composite material here to the edge with water, the tare of the balance takes place 27 to zero. Now the compressor K is turned on, whereby it is to be ensured that the block ball cock 30 is open. The pump 33 starts to work and pumps water from the water tank / container 28 in the respective compressed gas tank S1, whereby the water tank / container 28 becomes lighter and the display of the balance goes into the minus range. When the test pressure (300 bar) is established, the block ball valve becomes 30 closed and the pump 33 turns off. The negative value indicated by the balance is noted. This amount corresponds to the volume of what has been pumped under pressure sers. Again, the check valve prevents 36 in that water flows back from the gas bottle and the test pressure drops. The compressed gas container in the form of a gas cylinder must hold this pressure for about 30 seconds without pressure drop. Now the three-way cock 43 positioned so that the water from the pressurized gas container S1 through the test tube 53 , the highest pressure hose 45 and the third pressure medium line 51 into the water tank / container 28 can flow and the pressure in the gas cylinder is reduced to zero. The weight of the water tank / container 28 rises again. Subtracting this amount from the weight of the water tank / container 28 During the test pressure, the amount of permanent expansion of the gas container is obtained via the weight difference and the corresponding volume difference.

Of the testing procedure for the other compressed gas tank S2, S3 ..... repeated in the form of composite gas cylinders accordingly.

Of the Sequence continues as described above for the steel bottles.

To the pressure test can the compressed gas tank in the form of gas cylinders with a mark and / or a paint with a reference to the next inspection date. Also check the connection thread and steel bottles Weight control provided. Such compressed gas containers can as seamless pressure vessel be educated. Seamless steel bottles find e.g. in fire extinguishing technology Application. Furthermore, seamless trailer bottles for hydrogen, Diving bottles or seamless steel cylinders for respiratory protection and rescue technology, hydraulic and pneumatic applications, as well as acetylene and liquefied Gases, technical gases, etc. used. Seamless container made Composite materials can circumferentially wound or fully wound composite pressure vessels for the transport of compressed gases, hydrogen and LPG tanks for gas powered vehicles or composite bottles for use in respiratory protective equipment.

There the operating pressure varies depending on the application, the Test pressure be adjusted accordingly and can be over 500 bar.

To test a safety valve V this gem. 5 via a hydraulic hose coupling 46 to the high pressure hose 45 connected. The manometer 44 serves to control and adjust the test pressure. Before starting the test procedure, make sure that the piping system is filled with pressure medium / water. Now the taring of the balance takes place 27 under the water tank / container 28 to zero. Now the compressor K is turned on, whereby it is to be ensured that the block ball cock 30 is open. The pump 33 starts to work and the test pressure is built up. If water flows out of the safety valve V at the appropriate pressure, this will be discharged from the collecting container 54 added.

About the negative value, the balance 27 Even with small quantities flowed off, it can be recognized whether the safety valve V has opened at test pressure. After completion of the test, the three-way cock 43 positioned so that the water from the gas cylinder through the test tube 53 , the highest pressure hose 45 and the third pressure medium line 51 into the water tank / container 28 can flow and the pressure is reduced to zero.

Alternatively, instead of the balance 27 under the water tank / container 28 also under the collecting container 54 a balance (not shown) for detecting the change in weight and thus the outflow of pressure medium from the valve V are used. According to unillustrated embodiments, several safety valves can also be subjected to a corresponding test at the same time, these then being connected to each other in parallel to the high-pressure hose and each safety valve is assigned to a separate collecting container with scale.

Farther Is it possible, for detecting the outflow a safety valve when the test pressure is reached instead of a balance to provide a humidity or flow sensor or a level sensor in the collection container to arrange.

1

stand

1a

first vertical carrier

1b

one second vertical support

2

support element

2.1

Contact surfaces of the support element

2a

first Side of the support element

2c

opposing Side of the support element

3

fixing

3.1

Fixing surfaces of the fixing

4

mother

5

threaded rod

6

mother

7

mother

8th

first wave

12

second wave

16

first gear

17

retaining bolt

18.1, 18.2, 18.3

drilling

23

second gear

26

crank

27

Libra

28

container

29

compressor hose

30

Block ball valve

31

filter

33

pump

34

first Pressure medium line

36

check valve

37

second Pressure medium line

39

safety valve

43

Three-way ball valve

44

Pressure gauge / manometer

45

High pressure hose

46

Hydraulic hose coupling

51

third Pressure medium line

53

Test lead

54

receptacle

AD

swivel axis

AK

axis of rotation

K

compressor

S1, S2, S3

gas cylinders

T

table

V

safety valve

W

connecting thread

Claims (29)

Test stand for pressurized safety devices, which can be acted upon by a test pressure by liquid pressure medium, wherein the liquid pressure medium from a container ( 28 ) and the pressure of the liquid pressure medium with a pump ( 33 ) and by means of a pressure gauge / manometer ( 44 ) is readable / detectable, the pump ( 33 ) via a first pressure medium line ( 34 ) with the container ( 28 ), from the container ( 28 ) a second pressure medium line ( 37 ) to a three-way ball valve ( 43 ), a high-pressure hose ( 45 ) with the three-way ball valve ( 43 ) and of the three-way ball valve ( 43 ) to the container ( 28 ) a third pressure medium line ( 51 ), with the highest pressure hose ( 45 ) can be connected to the safety device to be tested and acted upon by a test pressure by liquid pressure medium and by detecting - the pressure drop of the test pressure with the pressure gauge / manometer ( 44 ) and / or - a change in the container ( 28 ) amount of pressure medium by means of a balance ( 27 ) or - the discharge of pressure medium from the safety device is testable. Test stand according to claim 1, characterized in that when testing pressure-loaded safety devices in the form of compressed gas containers (S1, S2, S3), these with their connection / connection thread (W) to the high-pressure hose ( 45 ) and are received in a rotating device, which in the starting position a support element ( 2 ) for horizontal laying at least one compressed gas container (S1, S2, S3), that the launched compressed gas container (S1, S2, S3) by means of a fixing element ( 3 ) on the support element ( 2 ) is fixable and that the support element ( 2 ) from the starting position - in a test position in which the connection / the connection thread (W1, W2, W3) of the compressed gas container (S1, S2, S3) facing upward and - in a discharge position in which the connection / the connection thread (W ) of the compressed gas tank (S1, S2, S3) facing down, about a pivot axis (AD) is pivotable. Test stand according to claim 2, characterized in that the support element ( 2 ) of the rotating device on two opposite sides ( 2a . 2c ) is rotatably mounted. Test stand according to claim 2 or 3, characterized in that the support element ( 2 ) is formed in the manner of a table or frame. Test stand according to one of claims 2 to 4, characterized in that the support element ( 2 ) for each compressed gas container (S1, S2, S3) prismatic bearing surfaces ( 2.1 ) having. Test stand according to one of claims 2 to 5, characterized in that the fixing element ( 3 ) prismatic fixing surfaces ( 3.1 ) having. test bench according to one of the claims 2 to 6, characterized in that the pivot axis (A) of the rotating device in the middle of the diameter of the compressed gas container (S1, S2, S3) is located. Test stand according to one of claims 2 to 7, characterized in that the support element ( 2 ) by his side ( 2a ) over a first wave ( 8th ) on a first vertical support ( 1a ) and on its opposite side ( 2c ) via a second wave ( 12 ) on a second vertical support ( 1b ), wherein the first and the second carrier ( 1a . 1b ) on a stand ( 1 ). test bench according to one of the claims 2 to 8, characterized in that the rotating device manually or by means of a motor is operable. Test stand according to claim 9, characterized in that the test device by means of a about an axis of rotation (AK) rotatable crank ( 26 ) is operable. Test stand according to claim 9 or 10, characterized in that the turning device in off initial position, test position and emptying position by means of a retaining bolt ( 17 ) is fixable. test bench according to one of the claims 9 to 11, characterized in that between the drive and the turning device is a translation is available. Test stand according to one of claims 10 to 12, characterized in that between the axis of rotation (AK) of the crank ( 26 ) and the pivot axis (AD) of the rotary device two gears ( 16 . 23 ) are arranged. Test stand according to one of claims 2 to 13, characterized in that the crank ( 26 ) on the side of the second vertical support ( 1b ) is arranged. Test stand according to claim 1, characterized in that on the high-pressure hose ( 45 ) a pressurized safety device in the form of a safety valve to be tested (V) can be connected. test bench according to claim 15, characterized in that on the safety valve to be tested a catch-up for emerging pressure medium is arranged. Test stand according to claim 16, characterized in that the collecting means a collecting container ( 54 ). Test stand according to one of claims 1 to 17, characterized in that the container ( 28 ) formed as a water tank and on the first vertical support ( 1a ) is arranged. Test stand according to claim 18, characterized in that the container formed as a water tank ( 28 ) on a first vertical support ( 1a ) fixed table (T) is arranged. Test stand according to one of claims 1 to 19, characterized in that under the container designed as a water container ( 28 ) or under the collecting container ( 54 ) a scale ( 27 ) is located. Test stand according to one of claims 1 to 20, characterized in that on the first vertical support ( 1a ) the pump ( 33 ) is arranged. Test stand according to claim 21, characterized in that the pump ( 33 ) over the container designed as a water container ( 28 ) is located. Test stand according to one of claims 1 to 22, characterized in that the pump ( 33 ) is a compressed air driven liquid pump. Test stand according to claim 23, characterized in that the pump ( 33 ) via a compressor hose ( 29 ) is connected to a compressor (K). Test stand according to claim 20, characterized in that the connection between the pump ( 33 ) and compressor (K) via a block ball valve ( 30 ) is interruptible. Test stand according to claim 24 or 25, characterized in that between pump ( 33 ) and block ball valve ( 30 ) a filter ( 31 ) is arranged. Test stand according to one of claims 1 to 26, characterized in that in the second pressure medium line ( 37 ) a check valve ( 36 ) is arranged. Test stand according to one of claims 1 to 27, characterized in that between the second pressure medium line ( 37 ) and the third pressure medium line ( 51 ) a safety valve ( 39 ) is arranged. Test stand according to one of claims 1 to 28, characterized in that the pressure gauge is a pressure gauge ( 44 ).